Not too thick in my opinion for Wild Simulated. After year 10 you will be lucky to have 10% of these left. So the spacing will improve as the years go on. Watch for deer, and slugs/snails. They love this stuff. If you can control them, most likely you will end up with a little better than 10% survival after 10 years.
Don't be afraid to hit them after a rain once or twice per season with some Miracle Grow the first year. It will help them be strong. Do not fertilize after that. Watch for disease in year one and two. You may want to spray a natural disease and pest control product on them the first couple years. Year one they are very susceptible to \"Tip Over\".
\"The major seedling disease of ginseng include \"damping off\" by Pythlum sp., Fusarlum sp., and Phytophthora sp. while \"tip over\" is caused by Rhizactonia sp. In addition other diseases include root rots by Fusarlum spp. Phytophthora cactorum, Sclerotinia panacis, leaf blight caused by Phytophthora cactorum, leaf and stem blight caused by Alternaria panax.\"
Or you can forgo all what I said and just let mother nature take it's course. Nothing wrong with that either.
Latt